Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in ATKR held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | Gates Capital Management, Inc. | 2.7M | $158.2M | -1.7% | 7.958% | 5.46% |
| 2 | BlackRock, Inc. | 2.6M | $154.7M | +2.8% | 7.783% | 0.00% |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | 2.1M | $123.1M | — | 6.194% | 0.01% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 1.5M | $89.3M | — | 4.489% | 0.00% |
| 5 | AMERICAN CENTURY COMPANIES INC | 1.4M | $84.8M | +14.8% | 4.264% | 0.04% |
| 6 | DIMENSIONAL FUND ADVISORS LP | 1.2M | $72.3M | +8.6% | 3.638% | 0.02% |
| 7 | FIRST TRUST ADVISORS LP | 1.2M | $72.3M | -11.5% | 3.635% | 0.05% |
| 8 | Coliseum Capital Management, LLC | 947K | $55.8M | +17.0% | 2.806% | 4.57% |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | 855K | $50.4M | +6.6% | 2.533% | 0.00% |
| 10 | STATE STREET CORP | 835K | $49.2M | +0.9% | 2.474% | 0.00% |
| 11 | EARNEST PARTNERS LLC | 778K | $45.8M | -0.7% | 2.305% | 0.19% |
| 12 | Hill City Capital, LP | 728K | $42.9M | 0.0% | 2.158% | 1.53% |
| 13 | HARDING LOEVNER LP | 705K | $41.5M | -3.8% | 2.088% | 0.43% |
| 14 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 698K | $41.1M | -0.9% | 2.068% | 0.02% |
| 15 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 533K | $31.4M | +51.7% | 1.579% | 0.04% |
| 16 | BANK OF AMERICA CORP /DE/ | 462K | $27.2M | +10.2% | 1.370% | 0.00% |
| 17 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 418K | $24.6M | +1.6% | 1.237% | 0.00% |
| 18 | GENDELL JEFFREY L | 400K | $23.6M | +3.4% | 1.186% | 0.32% |
| 19 | VICTORY CAPITAL MANAGEMENT INC | 379K | $22.3M | -23.0% | 1.124% | 0.01% |
| 20 | LONDON CO OF VIRGINIA | 378K | $22.2M | -8.3% | 1.119% | 0.14% |
| 21 | OSLO PENSJONSFORSIKRING AS | 377K | $22.2M | — | 1.117% | 3.46% |
| 22 | TWO SIGMA INVESTMENTS, LP | 353K | $20.8M | +60.9% | 1.046% | 0.02% |
| 23 | NEW YORK STATE COMMON RETIREMENT FUND | 344K | $20.2M | -0.7% | 1.018% | 0.03% |
| 24 | JACOBS LEVY EQUITY MANAGEMENT, INC | 343K | $20.2M | +6.0% | 1.017% | 0.09% |
| 25 | MORGAN STANLEY | 338K | $19.9M | -14.7% | 1.002% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in ATKR — a direct measure of their conviction.
Filings activity in ATKR during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 296 | 4.2% | 68.08% | 4.25 pp | $1.82B | 5.9% |
| Q4 2025 | 309 | +5.5% | 72.33% | 0.99 pp | $1.94B | 1.4% |
| Q3 2025 | 293 | +0.3% | 73.32% | 9.77 pp | $1.96B | 12% |
| Q2 2025 | 292 | +0.3% | 83.09% | +11.37 pp | $2.22B | +16% |
| Q1 2025 | 291 | 10% | 71.72% | 38.76 pp | $1.92B | 35% |
| Q4 2024 | 325 | 9.7% | 110.48% | +2.64 pp | $2.96B | +2.4% |
| Q3 2024 | 360 | 19% | 107.84% | 76.68 pp | $2.89B | 42% |
| Q2 2024 | 445 | — | 184.52% | — | $4.94B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying ATKR stock.
Based on Q1 2026 13F filings, institutional ownership of Atkore Inc. stands at 68.1%, held across 296 reporting institutions.
Gates Capital Management, Inc. is the largest reported institutional holder of ATKR, with approximately 2,685,718 shares worth $0.16B as of Q1 2026.
Yes — 1 widely-followed marquee investor appear among the top 25 institutional holders of ATKR, including TWO SIGMA INVESTMENTS, LP.
Our composite Smart Money Score for ATKR is 33 out of 100 (Bearish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
48 institutions opened new positions in ATKR during Q1 2026, while 61 fully exited. 78 added to existing positions and 168 trimmed.
ATKR institutional ownership fell by 4.25 percentage points quarter-over-quarter, with a net change of -13 holders.
The top 10 institutions account for 50.0% of all reported 13F value in ATKR, and the top 25 account for 73.4%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Atkore Inc. (ATKR) Institutional Ownership